I want to start a discussion on diy lighting equipment. Mostly light modifiers.
Now I want this to be fair so I would like to remind you that there are a lot of talented people out there that just can not afford equipment. At the risk of sounding egotistic I am one of those people. A student with barely a job and the love for photography. and i have built a few things that helped me out, and it turn out pretty great.

If you lack funds and have a healthy imigination, it is completely worth it. Use toilet paper as a diffuser, a rolled cereal box as a snoot, a forgotten cardboard box as a light tent, this list is limited only by yourself.

Oh, you might mean the source. Hell, use anything that illuminates. There are no limits.